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Finding the Fourth Proportional to 2,106.99, 3,160.76 and 645.89

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Solution

The fourth proportional to 2,106.99, 3,160.76 and 645.89 is: 968.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,106.99 : 3,160.76 = 645.89 : x
  2. Step 2: Convert to fraction form
    2,106.99/3,160.76 = 645.89/x
  3. Step 3: Cross multiply
    2,106.99x = 3,160.76 × 645.89
  4. Step 4: Simplify right side
    2,106.99x = 2,041,503.28
  5. Step 5: Solve for x
    x = 2,041,503.28/2,106.99
  6. Step 6: Final answer
    x = 968.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.